<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>symbol内置值</title>
</head>

<body>

    <script>
        class Person {
            static [Symbol.hasInstance](param) {
                console.log(param);
                console.log('我被用来检测类型了');
                return true;
            }
        }
        let o = {};
        // console.log(o instanceof Person);

        const arr = [1, 2, 3];
        const arr2 = [4, 5, 6];
        console.log(arr.concat(arr2));
        arr2[Symbol.isConcatSpreadable] = false;//将数组2作为一个整体进行合并
        console.log(arr.concat(arr2));




    </script>


</body>

</html>